六、Find the volume of the solid that is obtained when the region under the over the interval [1, 4] is revolved about the x-axis.(求當區間 [1, 4] 下圖形所圍成的區域繞 x 軸旋轉時所生成的固體體積。) (15 分)
五、Find y if 且 y (3) =1,求 y。) (20 分)